This wallpaper pattern is a cm classification. There are no rotations. There are vertical reflection lines between each semicircle down through the middle of the second row semicircles and back between the semicircles in the third row. There are also glide reflections in lines that are not reflection lines. That is, the semicircles are glide reflected from the first row onto the third row of the pattern but the staggered second line prevents it from being on a reflection line. There for, cm.
This wallpaper pattern is a cm classification. There are no rotations. There are vertical reflection lines between each semicircle down through the middle of the second row semicircles and back between the semicircles in the third row. There are also glide reflections in lines that are not reflection lines. That is, the semicircles are glide reflected from the first row onto the third row of the pattern but the staggered second line prevents it from being on a reflection line. There for, cm.
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